Leaky trunk

Any suggestions for fixing a leaky trunk. I am getting about a half inch of water in my spare tire well after it rains or snows.

You need new hatch seals...

It's an 05. I also put in aftermarket taillights. Could the leak be coming from there?

yes more then likely that is exactly where the leak is ... just make sure the seals are snug around the taillights if it still leaks try putting the stock ones back in and see what happens